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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="parser.compiler_support"></a><a class="link" href="compiler_support.html" title="Compiler Support">Compiler Support</a>
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<p>
      Boost.Parser requires C++17 or later. It is known to work with these compilers:
    </p>
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          GCC 9 and later
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          Clang 11 and later (and XCode 10.3 and later)
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          Visual Studio 2022 and later
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<h4>
<a name="parser.compiler_support.h0"></a>
      <span class="phrase"><a name="parser.compiler_support.c__20_support"></a></span><a class="link" href="compiler_support.html#parser.compiler_support.c__20_support">C++20
      Support</a>
    </h4>
<p>
      C++20 concept-based constraints on template parameters are used if you build
      in C++20 (or later) mode, and the compiler defines <code class="computeroutput">__cpp_lib_concepts</code>.
      In C++17 mode, most templates are simply unconstrained. If you want to disable
      the use of concepts entirely, you can define <code class="computeroutput">BOOST_PARSER_DISABLE_CONCEPTS</code>.
    </p>
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<div class="copyright-footer">Copyright © 2020 T. Zachary Laine<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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